I feel that a lot of the time I go out and play music, more to just play for people than to make money. Of course, I accept contributions, and I appreciate all these tips on how to catch more attention, but I feel that the main goal is to make people smile. I've seen groups of three or four people with various instruments play on the streets. They make such a good combination and have so much fun that people always want to contribute a few dollars. It adds up fast. Happiness is contagious. I think you'll have the most success if you enjoy yourself, and show passers-by that they can enjoy themselves too.